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You can get one of the cutters at home depot or lowes hardware
I have a tool called a fly cutter. It is like a compass it is adjustable andyou just set the diameter and make a single cut mine adjusts from3/4 inch to 4 inches.
you could try cutting it out with a hobby knife or exacto blade
do you mean cutting the umd door?i do it with a manual control milling amchine (i know....but i'm saving up for a cnc one)
i have found a much simpler way, cut a hole in the center with anything put some pliers in the hole and simply snap the plastic. when you get to the silver ring slide a blade or knife underneath and pry it off. then simply continue with the pliers, put it near to the edge of the curve where the silver ring used to be and just bend it to snap it off, it will follow the curvature of the shape and leave you with a pretty much perfect circle, i then simply file the rough edges and your done.